var logo=document.getElementById("logo");
window.onmousemove=function(e){
	var event=e || window.event;
	var x=event.clientX;
	var y=event.clientY;
	//鼠标移开的时候，让其回归原位(上，左，右，下)
	if(x<=10 || y<=10 || x>=(document.body.clientWidth-logo.offsetWidth)){
		x=-300;
		y=-300;
	}
	//鼠标移动的时候，让图片跟随移动
	logo.style.left=x+"px";
	logo.style.top=y+"px";
	
	
	
	//客户区
	//console.log("x:"+event.clientX+"y:"+event.clientY);
	//屏幕
	//console.log("x："+event.screenX+"y："+event.screenY);
}